Derrick



UNITED STATES PATENT OFFICE.

GEORGE DRIVER AND FRANK DRIVER, OF TOLEDO, OHIO.

DERRICK.

SPECIFICATION forming' part of Letters Patent No. 348,726, datedSeptember 7, 1886. Application iled May 5, 1886. Serial No. 201,225. (Nomodel.)

T0 a/ZZ whom, t may concern:

Be it known that we, GEORGE DEIvER and FRANK DIiIvER, of Toledo,Lucascounty,Ohio, have invented certain new and useful Improvements inDerricks, of which the following is a specification.

Our improved derrick will be readily understood from the followingdescriptio'n,taken in connection with the accompanying drawings, inwhich- Fgure l is aside elevation of our del-rick, showing a portion ofone of the side timbers broken away, in order to develope the gaffbridgein vertical section; and Fig. 2, a rear View of the same, thehoisting-face ofthe derrick being assumed as the front. yIn thedrawings, many of the usual and essential accessoriessuch as guy-ropes,trackboards,&c.-

are omitted.

In this specification we apply the term gant to the outwardly-swingingelement of the derrick. Such an element might, probably,with proprietybe termed either a gaff or a boom,77 both terms being often employed.XVe have preferred to use the term gai'i' as more appropriate to anelement which serves in suspending a load from above.

In the drawings, A indicates the vertical side timbers ol' the derrick;B, the cap-piece of the derrick-frame; O, the sill of the derrickframe;D, foot-wheels, housed,as usual, below the sill, the axes of thesewheels being at right angles to the general plane of the derrickframe;E, cross-framing disposed between the.

side timbers near the base ofthe derriek-frame; F, a vertical timberdisposed between the side timbers of the derrick -frame and reachingirom the sill to the cross-framing; G, a winding-reel journaled in thederrick frame near its base and extending from the vertical piece F toone of the side pieces, and provided,pref erably, with a spool-head; H,an engine and boiler mounted on the derrick-frame below thecross-framing, and between the vertical timber F and one of the sidetimbers; J,trans Initting machinery-as belting and gearingby which themotion of the engine is transmitted to the winding-reel; K, a horizontalgaif-bridge disposed between the two side timbers of the derrick-frame,and Iirmly connected thereto and supported thereby; L, a gaff with itsvfoot supported by the gaiI-bridge; M, a substantially vertical pivotborne by the gaffbridge, and serving as a means by which the gaff-bridgesupports the gafi", N, a horizontal pivot uniting the gafi'and saidvertical pivot; O, a block slung at the head of the gaff; P, a blockslung at the foot ofthe gafl", Q, a hoisting-rope leading from thehoisting-reel through the blocks O and I), its hanging end beingintended for attachment to the load to be hoisted; R, a pair of blocks,one slung at the cap of the derriek and the other slung at the head l ofYthe gai", and S the gafi supporting rope, running through these blocksand then brought below to the base of the derriek, being shown in thedrawings as belayed to' the derrickframe, and adapted for engagementwith the spool-head of the hoisting-reel.

The derrick-fraine is to have the usual guyropes, and in use the derrickwill incline forward somewhat, the strains coming, in the usual manner,upon the rear guys. Theload is hoisted by means of the rope Q, thehoistingreel being operated by the engine. The drawings show thehoisting-rope as falling vertically from a single block, O, butobviously multiple sheave blocks may be employed and should be employedfor heavy hoisting. The derrick-frame is moved edgewise in the usualmanner, traveling upon the wheels D. The

engine and boiler, setting inward between the side timbers, enables theside movement ofthe del-rick to take place in a very restrictedpassage-way. rlhe head of the gait' may be adjusted toward and from thederrick-frame by means of the rope S, and the load may thus be depositedat various distances from the foot of the derrick, these distances notbeing limited in extent by the length of the gait, as the top of thederriek itself may be dropped forward by the usual manipulations of therear guys. As the head of the gaii' is adj usted inwardly and outwardly,the gai oscillates upon the pivot N. The head of the gai may be swung inan are, the pivot Mforming the axis of this swinging motion, the radiusof the are being dependent upon the outward position of the bead of thegaii. The gaff is at liberty to sweep through about half a circle uponthe pivot M without being 4interfered with by the derrick-frame. Thehoisting-rope may thus IOO receive and deliver loads anywhere withinhalf a circle whose radius is represented by the length of the gaff plusthe permissible lean of the derriclcframe at the galt-pivot point, andat the same time the derrick-frame may be moved sidewise through anextremely narrow passage-way, thus enabling the hoisting rope to receiveand deliver its loads at any point Within a rectangular area whose widthis measured by the length of the gaff plus the permissible lean of thederrick-frame at the griff-pivot point, and whose length is measured bythe side travel given to the derrick-frame. The transverse outwardstrain upon the derrick-frame, due to the thrust of the gaff, nds acompensation in the inward pull upon the block P, thus permitting thehandling of very heavy loads withl a comparatively light derrick-frame.

When the gaff is'projecting outward from the face of the derrick, as inFig. l, and supporting a load, there will be tensional strains upon theusual rear guy-ropes of the derrick; but as the gait is swung aroundthedirection of strain is not so materially changed as to at all interferewith the steadiness with which the derrick supports its load. This isdue to the fact that side steadiness is given by the broad wheel-base,little or no strain coming upon any side guys while the gaft isswinging. Our derrick is thus peculiarly adapted for the operations ofthe stone-setter in the construction of buildings,and in a very extendedpractice with the derrick in this work we have found it possessing asteadiness and a certainty ot' delivery of load at a predetermined spotnot found in other structures.

lVe claim as our inventionthe foot of the derrick, a block at the headof 5o the gaff, a block at the foot of the gaia winding-reel at the baseof the derrick-frame, and a winding-rope engaging said two last-mcntioned blocks and said reel, combined substantially as and for thepurpose set forth.

2. A hoisting mechanism comprising a dcrriek-frameformed of two sidetimbers', a cap, and a sill, cross-framing between the side timbersabove the sill, a vertical timber disposed between the side timbers andreaching from the sill to said cross-framing, a winding-reel ]'ournaledin the derrick-frame, an engine and boiler disposed upon the sill of thederrickframe between one of the side timbers and the said verticaltimber, mechanism adapted for the transmission of motion from the engineto the winding-reel, a block supported at the upper part of the derrick,and a hoisting-rope engaging said block and said winding-reel,substantially as and for the purpose set forth.

GEORGE DRIVER. FRANK DRIVER.

Vitnesses:

J. W. SEE, W. A. SEWARD.

